/*
 * Copyright 2010 Mozzart
 *
 *
 * This file is part of mozzes.
 *
 * mozzes is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * mozzes is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with mozzes.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
package org.mozzes.application.hibernate.transaction;

import org.hibernate.Session;
import org.hibernate.Transaction;
import org.mozzes.application.module.scope.TransactionScoped;
import org.mozzes.application.plugin.transaction.TransactionException;

import com.google.inject.Inject;

@TransactionScoped
public class HibernateTransaction {

  private Session session;
  private Transaction transaction;

  @Inject
  private HibernateUtil hibernateUtil;

  public Session getSession() {
    return session;
  }

  void begin() {
    if (session != null)
      throw new TransactionException("Illegal transaction state, transaction already exists");

    this.session = hibernateUtil.openSession();
    this.transaction = session.beginTransaction();
  }

  void commit() {
    if (transaction == null)
      throw new TransactionException("Illegal transaction state, transaction doesn't exist");

    transaction.commit();
  }

  void rollback() {
    if (transaction != null)
      transaction.rollback();
  }

  void clear() {
    transaction = null;
    if (session != null) {
      try {
        hibernateUtil.closeSession(session);
      } finally {
        session = null;
      }
    }
  }

}
